74477126 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 74477126 is a 680 µH shielded drum core wirewound inductor rated for 550 mA with a maximum DC resistance of 1.2Ohm. This surface mount component operates across the temperature range of -40°C to 125°C and is designed for applications requiring fixed inductance in compact form factors. The part is actively manufactured and maintains ROHS3 compliance with AEC-Q200 ratings. Equivalent and substitute parts are identified to provide design flexibility, inventory alternatives, and sourcing options while maintaining functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

74477126

Würth ElektronikIn Stock: 95674477126 Datasheet

Current PartRFQ

SRR1260-681K

Bourns Inc.In Stock: 2274SRR1260-681K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74477126 with the Bourns Inc. SRR1260-681K is based on the following critical parameters:

Inductance value remains constant at 680 µH, ensuring primary functional equivalence. Both parts utilize ferrite core material with shielding, maintaining electromagnetic performance characteristics. Surface mount packaging and nonstandard case dimensions allow mechanical compatibility within the same PCB footprint constraints. Operating temperature ranges are identical (-40°C to 125°C), supporting equivalent thermal performance. Both components maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

The substitute part demonstrates enhanced electrical performance through higher current rating (800 mA vs. 550 mA) and lower DC resistance (1.15Ohm vs. 1.2Ohm maximum), making it suitable for applications requiring improved current handling capacity while maintaining the specified inductance value.

Parameter Comparison

Engineering Selection Recommendations

Both the 74477126 and SRR1260-681K maintain active product status with full regulatory compliance. The 74477126 carries AEC-Q200 ratings, qualifying it for automotive applications. The SRR1260-681K does not specify AEC-Q200 certification in the provided data.

Selection between these parts depends on application current requirements. The 74477126 is suitable for designs operating at or below 550 mA. The SRR1260-681K accommodates higher current applications up to 800 mA while providing tighter inductance tolerance (±10% vs. ±20%) and marginally lower DC resistance. Both components satisfy identical thermal and compliance requirements across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the SRR1260-681K directly replace the 74477126 in existing designs?

A: Direct substitution is possible when the application current requirement does not exceed 550 mA. The SRR1260-681K's higher current rating and lower DC resistance provide additional design margin. Physical dimensions differ slightly (12.50mm x 12.50mm vs. 12.00mm x 12.00mm), requiring PCB layout verification.

Q: What are the key differences in electrical performance?

A: The SRR1260-681K provides 800 mA current rating versus 550 mA for the 74477126, with lower maximum DC resistance (1.15Ohm vs. 1.2Ohm). Inductance tolerance is tighter on the substitute part (±10% vs. ±20%). Both maintain identical 680 µH inductance and ferrite shielded construction.

Q: Are there compliance or certification differences?

A: The 74477126 carries AEC-Q200 automotive qualification. The SRR1260-681K data does not specify AEC-Q200 certification. Both parts maintain ROHS3 compliance, unlimited MSL rating, and REACH unaffected status.

Q: How do physical dimensions affect substitution?

A: The 74477126 measures 12.00mm x 12.00mm x 6.00mm (height). The SRR1260-681K measures 12.50mm x 12.50mm x 6.50mm (height). PCB footprint and clearance requirements must be evaluated for mechanical compatibility in space-constrained applications.

Q: What is the substitution logic for inductance value?

A: Both parts specify identical 680 µH inductance at their respective test frequencies (1 kHz for 74477126, 100 kHz for SRR1260-681K). Functional inductance equivalence is maintained across the operating frequency range, with self-resonant frequencies within 0.1 MHz of each other.